Product manual

3.11 Group 3 and 4 commands
Group 3 commands are reserved. Group 4 commands are 16-byte
commands. Group 4 commands are not supported. If the drive receives
one of these commands, it returns a check condition status.
Caution.
Do not use Group 3 and 4 commands. If you do, you may
destroy data on the disc.
3.12 Group 5 and 6 commands
Group 5 and 6 commands are 12-byte commands. Group 5 commands are
not implemented. If the drive receives a Group 5 command, it returns a check
condition status. Group 6 commands are reserved for Seagate use.
Caution.
Do not use Group 6 commands. If you do, you may destroy
data on the disc.
3.13 Group 7 commands
Group 7 commands are 10-byte commands. These commands are not
implemented. If the drive receives one of these commands, it returns a
check condition status.
Medalist Pro 2160N/2160WC Product Manual, Rev. A 85